The Onnex Resistance is built with new and improved sears resulting in our best resistance yet New searing system allows for improved consistency and reliability aiding you in your perfect shot every time Great way to get you back into a true back tension shot sequence due to it forcing you to pull through your shot Each Onnex handle will allow for the shooter to change between one of the three handle types thumb button, back tension, & resistance seamlessly while maintaining anchor point & peep height Loop retainer allows connection to your bow with the single open hook while keeping your release connected Heavy Metal construction adds weight and forgiveness Available in multiple sizes to comfortably fit any archer's hands STAN Trainer Lock feature allows for practice of trigger activation without actually firing Included: Three and four finger attachments, large and small barrels, two-barrel extensions